Video encoding method and apparatus, and video decoding method and apparatus

Abstract

Provided are a method and apparatus for performing combination prediction by obtaining a weight for intra prediction and inter prediction by taking into account at least one of a distance between a reference picture and a current picture, a size of a current block, and characteristics of the inter prediction and intra prediction. An image decoding method according to the present disclosure includes parsing, from a bitstream, combination prediction information indicating whether to predict a current block by combining intra prediction and inter prediction; determining whether to perform combination prediction on the current block, based on the combination prediction information; obtaining, when the combination prediction is performed, a first prediction value by performing the inter prediction on the current block, and obtaining a second prediction value by performing the intra prediction on the current block; determining a weight for the inter prediction and a weight for the intra prediction, based on at least one of a distance between a reference picture and a current picture, a size of the current block, and characteristics of the inter prediction and the intra prediction; and performing the combination prediction, based on the weight for the inter prediction, the weight for the intra prediction, the first prediction value, and the second prediction value.

Description

TECHNICAL FIELD[0001]The present disclosure relates to encoding and decoding of a still image or video by combining an intra prediction result and an inter prediction result.BACKGROUND ART[0002]As hardware for reproducing and storing high resolution or high quality video content is being developed and supplied, a need for a video codec for effectively encoding or decoding the high resolution or high quality video content is increasing.[0003]A convention image decoding / encoding video codec predicts a current block by using one of intra prediction and inter prediction. The intra prediction is a prediction technology of allowing only a spatial reference, and the inter prediction is a compression method of deleting redundancy in data by referring to a previously-encoded image. The image decoding / encoding video codec uses only one of a spatial reference and a temporal reference, thus, there is a problem that not all of a spatial characteristic and temporal characteristic of an image are ...

AI Technical Summary

Benefits of technology

The present patent is about a method and apparatus for effectively encoding and decoding high resolution or high quality video content. It proposes a method of combining intra prediction and inter prediction to obtain a weight for each prediction based on factors such as the distance between a reference picture and a current picture, the size of the current block, and the characteristics of the intra prediction and inter prediction. This weight is used to determine which prediction to use in the combination prediction, resulting in improved video quality and better video compression. The method can be applied to image codecs with a free structure. The technical effect of this patent is to provide a more effective and efficient way of predicting video content using both intra and inter prediction techniques.

Problems solved by technology

The image decoding / encoding video codec uses only one of a spatial reference and a temporal reference, thus, there is a problem that not all of a spatial characteristic and temporal characteristic of an image are reflected.

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